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Office 365 Limits (attachment size, quotas, message size and more)

Below are some of the limits for Office 365 accounts - more detailed information can be found at Exchange Online Limits

Starting Monday, February 5, 2018, both Office 365 and UI Healthcare email systems will increase the maximum message send/receive limits to 150mb. This change is being made to allow easier collaboration within the University of Iowa. Please keep the following in mind:

Maximum total message send/receive size is 150mb. This includes both the message content and attachments.

Attaching a large file to an email message requires uploading that file to the email system. This can increase the time required to send the message.

Whenever possible, it is advised to use a file collaboration tool for large files. The University of Iowa supports Microsoft OneDrive for Business which allows for file sizes larger than 150mb.

LIMIT TYPE

Outlook
(Windows)

Office365.com
(OWA)

Outlook
(Mac)

Message send/receive size limit (including attachments) - Keep in mind that someone's mailbox on the Office 365 server will be prohibited from receiving messages if they exceed their maximum quota limit. Note: when you attach a file to a message, the file size of the attachment increases (it can increase as much as 30% in size when it is sent).